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Record 6 of 27
Active control of interior noise in a large scale cylinder using piezoelectric actuators
Author and Affiliation:
Lester, H. C.(NASA Langley Research Center, Hampton, VA, United States)
Silcox, R. J.(NASA Langley Research Center, Hampton, VA, United States)
Abstract: The noise reduction effectiveness of two types of control force actuator models has been analytically investigated: (1) a point actuator, and (2) an in-plane, piezoelectric actuator. The actuators were attached to the wall of a simply supported, elastic cylinder closed with rigid end caps. Control inputs to the actuators were determined such that the integrated square of the pressure over the interior of the vibrating cylinder was a minimum. Significant interior noise reductions were achieved for all actuator configurations, but especially for the structurally dominated response. Noise reduction of 9 dB to 26 dB were achieved using point force actuators, as well as localized and extended piezoelectric actuators. Control spillover was found to limit overall performance for all cases. However, the use of extended piezoelectric actuators was effective in reducing control spillover, without increasing the number of control degrees of freedom.
Publication Date: Jan 01, 1991
Document ID:
19930045428
(Acquired Dec 28, 1995)
Accession Number: 93A29425
Subject Category: ACOUSTICS
Document Type: Conference Paper
Publication Information: In: AHS and Royal Aeronautical Society, Technical Specialists' Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71); 18 p.; (SEE A93-29401)
Publisher Information: American Helicopter Society, Alexandria, VA, United States
Financial Sponsor: NASA; United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 18p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACTIVE CONTROL; ACTUATORS; AIRCRAFT NOISE; NOISE REDUCTION; PIEZOELECTRICITY; VIBRATION ISOLATORS; ACOUSTIC ATTENUATION; AERODYNAMIC NOISE; DEGREES OF FREEDOM; ELASTIC CYLINDERS; MATHEMATICAL MODELS
Imprint And Other Notes: In: AHS and Royal Aeronautical Society, Technical Specialists' Meeting on Rotorcraft Acoustics/Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71), 18 p.
Miscellaneous Notes: Previously announced in STAR as N92-32958
Availability Source: Other Sources
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